Percentage Calculator
Calculate what a percentage of a number is.
Percentage measurements
Enter your values, then calculate.
Result
How to calculate percentage
This calculator finds a percentage of any number — the everyday math behind calculating a tip, a discount, a commission, or any "what is X% of Y" question you run into in daily life or work.
How the calculation works
Result = (Percent ÷ 100) × Number. This converts the percentage into a decimal fraction and multiplies it by the number you're taking a percentage of.
Example
What is 15% of $84 (a common tip calculation)? Result = (15 ÷ 100) × 84 = 0.15 × 84 = $12.60. For a 20% discount on a $65 item: (20 ÷ 100) × 65 = $13.00 off, bringing the price to $52.
Frequently asked questions
How do I calculate a percentage increase or decrease instead?
That's a different calculation — percentage change is (New value − Old value) ÷ Old value × 100. This calculator answers a simpler question: what is X% of a given number.
Can I use this to find what percentage one number is of another?
Not directly with this exact tool — that reverse question (X is what percent of Y?) uses a different formula: (X ÷ Y) × 100. This calculator goes the other direction, from a known percentage to a resulting amount.
Percentage Calculator
Result = (Percent ÷ 100) × Number. This converts the percentage into a decimal fraction and multiplies it by the number you're taking a percentage of.
Let's understand your percentage result.
Calculate a result above and this guide will help you interpret it using this calculator's own formula and explanation.
Pro Tips for Percentage
- For a discount, calculate the percentage first, then subtract it from the original price — this calculator gives you the discount amount, not the final discounted price directly.
- For a tip on a bill that already includes tax, decide whether you want to tip on the pre-tax or post-tax amount — conventions vary, so use whichever total your situation calls for.
- This same formula works for markups, commissions, interest amounts, and any other "percent of a number" calculation — it's one formula with many everyday uses.
Common Percentage Mistakes to Avoid
- Entering the percentage as a decimal (0.15) instead of a whole number (15) — this calculator expects the percentage form and does the decimal conversion internally.
- Confusing 'percent of a number' with 'percentage change between two numbers' — those are different calculations; this tool answers the former, not the latter.
When to Use This Calculator
This calculator finds a percentage of any number — the everyday math behind calculating a tip, a discount, a commission, or any "what is X% of Y" question you run into in daily life or work.